get geico. fifteen minutes could save you fifteen percent or more. [ticking] >> warren buffett wants his oldest son, howard, to succeed him as chairman of his multibillion-dollar holding company, berkshire hathaway. it's not unusual for a father to want his son to take over the family business. but it's a little unusual in this case. howard doesn't pick stocks, he picks corn. howard buffett is a farmer. and as lesley stahl discovered in december 2011, he devotes a lot of his time and money to helping others learn how to farm better. [rooster crows] >> in places like el salvador, he's funding a training program for 5,000 poor farmers like carla and edwin trujillo. they learn new planting and fertilizing techniques to improve the quality of their corn and red beans. >> carla, i'm howard. >> hola. mucho gusto. >> buenos dias. >> we tagged along as howard inspected their six-acre plot in the tiny village of san juan el espino. >> and she's got an irrigation system. >> no big combines here. and their irrigation? it consists of hoses connected to a barrel